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Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test

From Laura Abbott <labbott@redhat.com>
Newsgroups linux.kernel
Subject Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test
Date 2016-02-24 20:00 +0100
Message-ID <r5MPf-cO-13@gated-at.bofh.it> (permalink)
References (4 earlier) <r42lr-4kK-1@gated-at.bofh.it> <r54lc-274-3@gated-at.bofh.it> <r56Q3-3YI-41@gated-at.bofh.it> <r5sGS-2L7-17@gated-at.bofh.it> <r5tMC-3DJ-15@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 02/23/2016 02:37 PM, Kees Cook wrote:
> On Tue, Feb 23, 2016 at 1:25 PM, Kees Cook <keescook@chromium.org> wrote:
>
>> zero poison only:
>> DEBUG_PAGEALLOC=n
>> PAGE_POISONING=y
>> PAGE_POISONING_NO_SANITY=y
>> PAGE_POISONING_ZERO=y
>> page_poison=on
>
> This combo (in next-20160223) results in an unusable system. :(
>
> [    1.754183] random: init urandom read with 11 bits of entropy available
> [    1.768449] hostname (1171) used greatest stack depth: 11808 bytes left
> [    1.787954] BUG: Bad page map in process init  pte:3d656c6f736e6f63
> pmd:00020067
> [    1.789177] addr:00007f9f68200000 vm_flags:00000070 anon_vma:
>     (null) mapping:ffff88007c314058 index:141
> [    1.790564] file:libdl-2.19.so fault:ext4_filemap_fault
> mmap:ext4_file_mmap readpage:ext4_readpage
>
> -Kees
>

Hmmm, it looks like the -mm tree currently only has the v1 of the
poisoning patches and not the v2. The v1 had a bug which would
cause issues like this due to some pages not getting zeroed fully. I should
follow up on that today.

Thanks,
Laura

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Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-23 22:30 +0100
  Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-23 23:40 +0100
    Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-02-24 20:00 +0100
  Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-24 18:30 +0100
    Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-02-24 20:50 +0100
      Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-24 22:50 +0100
        Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-25 00:40 +0100
          Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-02-25 02:30 +0100
            Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-25 18:40 +0100
              Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-02-26 00:20 +0100
                Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-26 17:10 +0100
                Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-02-26 23:20 +0100
                Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Kees Cook <keescook@chromium.org> - 2016-02-26 23:40 +0100
                Re: [PATCHv2] lkdtm: Add READ_AFTER_FREE test Laura Abbott <labbott@redhat.com> - 2016-03-01 02:40 +0100

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